Image projection apparatus, and control method of image projection apparatus

Abstract

An image projection apparatus includes a light source to emit light, an image generation unit including an image generation element to generate an image using the light emitted from the light source, an optical unit to guide the light emitted from the light source to the image generation unit, and to enlarge and project the image generated by the image generation unit, a drive unit to change any one of a position of the image generation element and a position of at least a part of the optical unit at specific timing, and a cooling device to cool one or more parts disposed in the image projection apparatus. An operation sound generated by the cooling device while the cooling device is being operated has a given frequency characteristic settable according to a drive frequency of the drive unit.

What is claimed is: 
     
         1 . An image projection apparatus comprising:
 a light source to emit light;   an image generation unit including an image generation element to generate an image using the light emitted from the light source;   an optical unit to guide the light emitted from the light source to the image generation unit, and to enlarge and project the image generated by the image generation unit;   a drive unit to change any one of a position of the image generation element and a position of at least a part of the optical unit at specific timing; and   a cooling device to cool one or more parts disposed in the image projection apparatus, an operation sound generated by the cooling device while the cooling device is being operated has a given frequency characteristic settable according to a drive frequency of the drive unit.   
     
     
         2 . The image projection apparatus of  claim 1 , wherein the image generation unit further includes a movable unit to include the image generation element in the movable unit,
 wherein the drive unit changes a position of the movable unit including the image generation element within a specific moveable range set for the movable unit at specific timing.   
     
     
         3 . The image projection apparatus of  claim 1 , wherein the drive frequency of the drive unit is set within a first frequency range setting a fundamental frequency of the operation sound generated by the cooling device as a center of the first frequency range. 
     
     
         4 . The image projection apparatus of  claim 1 , wherein the drive frequency of the drive unit is set within a second frequency range setting a harmonic sound component of a fundamental frequency of the operation sound generated by the cooling device as a center of the second frequency range. 
     
     
         5 . The image projection apparatus of  claim 1 , further comprising a controller to control a rotation speed of the cooling device according to the drive frequency of the drive unit. 
     
     
         6 . The image projection apparatus of  claim 1 , wherein the cooling device has one or more blades, and the number of the blade of the cooling device is adjustable according to the drive frequency of the drive unit. 
     
     
         7 . The image projection apparatus of  claim 1 , wherein the cooling device that cools the light source is a cooling fan. 
     
     
         8 . A method of controlling an image projection apparatus including a light source to emit light, an image generation unit including an image generation element to generate an image using the light emitted from the light source, an optical unit to guide the light emitted from the light source to the image generation unit, and to enlarge and project the image generated by the image generation unit, a drive unit to change any one of a position of the image generation element and a position of a part of the optical unit at specific timing, and a cooling device to cool one or more parts disposed in the image projection apparatus, the method comprising:
 operating the cooling device to cool the one or more parts disposed in the image projection apparatus; and   controlling an operation of the cooling device to set frequency characteristic of an operation sound generated by the cooling device according to a drive frequency of the drive unit.